Fixes for the ARM-specific bswap_16, bswap_32, and bswap_64.
1. Make the feature test work by excluding known-deficient processors, so
we don't have to maintain a complete list of all the processors that support
REV and REV16.
2. Don't abuse 'register' to get an effect similar to GCC's +l constraint,
but which was unnecessarily restrictive.
3. Fix __swap64md so _x isn't clobbered, breaking 64-bit swaps.
4. Make <byteswap.h> (which declars bswap_16 and friends) use <endian.h>
rather than <sys/endian.h>, so we get the machine-dependent implementations.
Change-Id: I6a38fad7a9fbe394aff141489617eb3883e1e944
diff --git a/libc/include/byteswap.h b/libc/include/byteswap.h
index 16d2ad4..74b0e91 100644
--- a/libc/include/byteswap.h
+++ b/libc/include/byteswap.h
@@ -28,7 +28,8 @@
#ifndef _BYTESWAP_H_
#define _BYTESWAP_H_
-#include <sys/endian.h>
+/* endian.h rather than sys/endian.h so we get the machine-specific file. */
+#include <endian.h>
#define bswap_16(x) swap16(x)
#define bswap_32(x) swap32(x)